100% agree with Winston's suggestion of the pumpkin, but since the OP said it's been an ongoing issue she may be better trying to resolve the actual issue first than simply cover it up. It's a great start that the vet has ruled out medical issues, but Hazel's suggestion to try a different protein may be a good starting point also. As I said though, for me, years back it was too much food. I fed what the bag said to feed and it was just too much. I always have at least 2 cans of pumpkin in my pantry for emergencies though.